International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
86
Weighting coefficient
The coefficient attached to an observation as its weight in a procedure involving weighting.
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122
Coefficient of variation
The standard deviation of a distribution divided by the mean, also expressed as a percentage.
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123
Coefficient of variation of a probability distribution
The ratio of the standard deviation to the absolute value of the expectation.
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215
Confidence coefficient, or Confidence level
The measure of probability associated with a confidence interval is called `confidence coefficient` or `confidence level`......
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233
Correlation coefficient
A measure of the interdependence between two variates. It is usually a pure number which varies between -1 and +1 with the intermediate value zero indicating the absence of correlation, but not necessarily the independence of the variates. Usually denoted by the symbol r......
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239
Coefficient of multiple correlation
The product-moment correlation between the actual values of the dependent variate in multiple regression and the values as given by the regression equation. It measures the closeness of the combined association between a number of independent variables and the dependent variate. The coefficient is usually denoted by R but is regarded essentially, n.....
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241
Coefficient of determination
The square of the `coefficient of correlation`, the relative measure of the closeness of the association.
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242
Coefficient of multiple determination
The square of the `coefficient of multiple correlation R`, the measure of the closeness of the combined association of multiple variates......
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250
Regression coefficient
1 - The coefficient of an independent variable in a regression equation. 2- The slope of the regression line, i.e. b in the regression equation : y ` = a + bx.....
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342
Base units
The seven fundamental units of measurement upon which the International System of Units is based viz. Length (metre), weight mass (kilogram), time (second), electric current (ampere), thermodynamic temperature (kelvin), amount of substance (mole) and luminous intensity (candela)......
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350
Supplementary units
The SI units radian and steradian are called supplementary units. They are `dimensionless` derived units (more precisely, derived units of dimension one) with special names and symbols. Although the coherent unit for plane angle and for solid angle is expressed by the number 1, it is convenient to use the special names radian (rad) and steradian (s.....
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351
Derived units
Derived units are expressed algebraically in terms of base units. Their symbols are obtained by means of the mathematical signs of multiplication and division. The expression for the coherent derived units in terms of base units can be obtained from the dimensional products by using the following format substitution : L-->m, M-->kg, T-->s, I-->A, Q.....
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382
Non-SI units
There are certain units, recognized by the International Committee for Weights and Measures (CIPM) as having to be retained because of their practical importance (as given in the following tables)......
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410
Unified atomic mass unit
The unified atomic mass unit is equal to 1/12 of the mass of an atom of the nuclide 12C.
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577
British thermal units
img:equations//566_595_e.jpg
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578
British Thermal Units
img:equations//566_595_e.jpg
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579
British thermal units
img:equations//566_595_e.jpg
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799
Rainfall distribution coefficient
An index of Rainfall distribution, obtained by dividing the maximum rainfall at any point on a basin by the mean on the basin......
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800
Pluviometric coefficient, or Hyetal coefficient
The ratio of the actual precipitation in a month to what would have fallen had the rainfall been uniformly distributed throughout the year......
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850
Runoff coefficient
The ratio of depth of runoff to precipitation over a specified period.
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859
Drainage modulus, or Drainage coefficient
1 -The runoff from a drainage district expressed in depth units removed from the area in 24 hours. 2 - See 5242.
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878
Infiltration coefficient
The ratio of infiltration to rainfall.
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895
Pan coefficient, or Conversion coefficient
The ratio of evaporation from a large body of water to that from a pan.
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910
Coefficient of permeability, Hydraulic conductivity, Coefficient of conductivity, Unit of permeability, Transmission constant, Coefficient of transmission
1   The rate at which groundwater flows through a soil in response to a given hydraulic head. 2   The rate of flow of a fluid through a unit cross section of a porous mass under a unit hydraulic gradient, at a specified temperature. 3 - See 6497......
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912
Hydraulic gradient
1  The difference in hydraulic head at two points in a soil, divided by the distance between the points measured along the direction of hydraulic flow. 2   See 1831, 3051, 4207 and 5257......
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